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<pre><code class="lang-java"><span class="hljs-keyword">package</span> iterator;
<span class="hljs-keyword">import</span> java.util.*;
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">IteratorPattern</span>
</span>{
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span>
    </span>{
        Aggregate ag=<span class="hljs-keyword">new</span> ConcreteAggregate(); 
        ag.add(<span class="hljs-string">&quot;&#x4E2D;&#x5C71;&#x5927;&#x5B66;&quot;</span>); 
        ag.add(<span class="hljs-string">&quot;&#x534E;&#x5357;&#x7406;&#x5DE5;&quot;</span>); 
        ag.add(<span class="hljs-string">&quot;&#x97F6;&#x5173;&#x5B66;&#x9662;&quot;</span>);
        System.out.print(<span class="hljs-string">&quot;&#x805A;&#x5408;&#x7684;&#x5185;&#x5BB9;&#x6709;&#xFF1A;&quot;</span>);
        Iterator it=ag.getIterator(); 
        <span class="hljs-keyword">while</span>(it.hasNext())
        { 
            Object ob=it.next(); 
            System.out.print(ob.toString()+<span class="hljs-string">&quot;\t&quot;</span>); 
        }
        Object ob=it.first();
        System.out.println(<span class="hljs-string">&quot;\nFirst&#xFF1A;&quot;</span>+ob.toString());
    }
}
<span class="hljs-comment">//&#x62BD;&#x8C61;&#x805A;&#x5408;</span>
<span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">Aggregate</span>
</span>{ 
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">add</span><span class="hljs-params">(Object obj)</span></span>; 
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">remove</span><span class="hljs-params">(Object obj)</span></span>; 
    <span class="hljs-function"><span class="hljs-keyword">public</span> Iterator <span class="hljs-title">getIterator</span><span class="hljs-params">()</span></span>; 
}
<span class="hljs-comment">//&#x5177;&#x4F53;&#x805A;&#x5408;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ConcreteAggregate</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">Aggregate</span>
</span>{ 
    <span class="hljs-keyword">private</span> List&lt;Object&gt; list=<span class="hljs-keyword">new</span> ArrayList&lt;Object&gt;(); 
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">add</span><span class="hljs-params">(Object obj)</span>
    </span>{ 
        list.add(obj); 
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">remove</span><span class="hljs-params">(Object obj)</span>
    </span>{ 
        list.remove(obj); 
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> Iterator <span class="hljs-title">getIterator</span><span class="hljs-params">()</span>
    </span>{ 
        <span class="hljs-keyword">return</span>(<span class="hljs-keyword">new</span> ConcreteIterator(list)); 
    }     
}
<span class="hljs-comment">//&#x62BD;&#x8C61;&#x8FED;&#x4EE3;&#x5668;</span>
<span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">Iterator</span>
</span>{
    <span class="hljs-function">Object <span class="hljs-title">first</span><span class="hljs-params">()</span></span>;
    <span class="hljs-function">Object <span class="hljs-title">next</span><span class="hljs-params">()</span></span>;
    <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">hasNext</span><span class="hljs-params">()</span></span>;
}
<span class="hljs-comment">//&#x5177;&#x4F53;&#x8FED;&#x4EE3;&#x5668;</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ConcreteIterator</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">Iterator</span>
</span>{ 
    <span class="hljs-keyword">private</span> List&lt;Object&gt; list=<span class="hljs-keyword">null</span>; 
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">int</span> index=-<span class="hljs-number">1</span>; 
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ConcreteIterator</span><span class="hljs-params">(List&lt;Object&gt; list)</span>
    </span>{ 
        <span class="hljs-keyword">this</span>.list=list; 
    } 
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">hasNext</span><span class="hljs-params">()</span>
    </span>{ 
        <span class="hljs-keyword">if</span>(index&lt;list.size()-<span class="hljs-number">1</span>)
        { 
            <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
        }
        <span class="hljs-keyword">else</span>
        {
            <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>;
        }
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> Object <span class="hljs-title">first</span><span class="hljs-params">()</span>
    </span>{
        index=<span class="hljs-number">0</span>;
        Object obj=list.get(index);;
        <span class="hljs-keyword">return</span> obj;
    }
    <span class="hljs-function"><span class="hljs-keyword">public</span> Object <span class="hljs-title">next</span><span class="hljs-params">()</span>
    </span>{ 
        Object obj=<span class="hljs-keyword">null</span>; 
        <span class="hljs-keyword">if</span>(<span class="hljs-keyword">this</span>.hasNext())
        { 
            obj=list.get(++index); 
        } 
        <span class="hljs-keyword">return</span> obj; 
    }   
}
</code></pre>
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